filling up with protesters, more than 100,000 at times today, chanting against their president, mohamed morsi, claiming he jammed through a draft of a new constitution, which strengthens the muslim brotherhood against christians and liberals. critics say it would curb the rights of women and freedom of speech. >>> and back here at home, a terrifying scene in a small town. a train derailment that sent hazardous chemicals, a gas called vinyl chloride, spewing into the air. more than 70 people sought medical treatment for burning eyes, labored breathing. and abc's linsey davis is on the scene. >> reporter: thousands of gallons of the hazardous chemical vinyl chloride spewed into the air from the ruptured car. residents were told to stay in their homes. three schools within a mile ordered to keep students indoors. >> we are saying to all that are watching this, that live within the borough of paulsboro, it is a time for caution. >> reporter: 71 people were admitted to a local hospital. vinyl chloride is a colorless gas. inhaling it can cause dizziness, headaches and drowsiness. breathing very hig